Jessica Pegula is into the last four of a Grand Slam for only the second time

Jessica Pegula is into the last four of a Grand Slam for only the second time

Jessica Pegula said she had surprised herself by shaking off a poor run of form to reach the US Open semi-finals for the second year in a row on Tuesday.

The American fourth seed -- a beaten finalist in New York last year -- saw off Barbora Krejcikova 6-3, 6-3 and is yet to drop a set at the tournament.

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